Pearl MC Pre-Preamp - Page 22

cHoc · 14th February 2010, 06:33 PM

Quote:

Originally Posted by acidbrain

A few things here for the archive.

1. I changed the 2sk170's for (SMD) BF862.
It gives a little bit more gain and clearer sound.

Did you match those?

juma · 14th February 2010, 08:29 PM

Quote:

Originally Posted by acidbrain

....
1. I changed the 2sk170's for (SMD) BF862.
It gives a little bit more gain and clearer sound.
....

acidbrain · 14th February 2010, 09:20 PM

I matched them only to have equal gain for both channels, not to have the same gain as the 2sk170 did. It worked fine.

quote Andrew T. :

The BL is a 6 to 12mA device the 862 is 10 to 25mA device.
Look at the BL 12mA example of transconductance. You will see they show 30 to 40mS from 5mA to 10mA Id.
Choosing a very high BL, or a low V grade, will give a similar range of Yfs, if you run them at similar high Id.

spcspc20000 · 15th February 2010, 10:47 AM

It should be builded smaller ,i think so.

gervenja · 9th April 2010, 07:35 PM

Any boards left?
no kits

acidbrain · 9th April 2010, 08:17 PM

Pearl Two

gotoma8 · 24th June 2010, 08:59 PM

anxiously awaiting the kit...
T

Sodejuu · 12th November 2012, 03:16 PM

Quote:

Originally Posted by promitheus

Also there are 2 points on the board called Star1 and Star.
These 2 points need to be connected with a piece of wire.
This connects Audio Star Ground with ground plane.

Hello,

Sorry for my late reaction, but I got the complete kit just en few days ago and I'm building it now. What I don't get is why wasn't "Star" connected to "Star1" right away on the PCB? There is room for it?
Or is it an option to connect "Star1" to GND and leave "Star" connected to 0V?

Russellc · 12th November 2012, 05:32 PM

Quote:

Originally Posted by Sodejuu

Hello,

Sorry for my late reaction, but I got the complete kit just en few days ago and I'm building it now. What I don't get is why wasn't "Star" connected to "Star1" right away on the PCB? There is room for it?
Or is it an option to connect "Star1" to GND and leave "Star" connected to 0V?

What kit?

Russellc

Sodejuu · 13th November 2012, 10:32 AM

I got the complete kit a few days ago. That kit contains 2 mainboards, 2 MC pre boards and 2 PSU boards. This threat is about the MC pre boards, so that is also what my question is about. Once again, Why wasn't "Star" not connected to "Star1" when there is room on the PCB to do so?
Is it better to connect "Star1" to GND and leave "Star" connected to 0V (so not shorting 0V to GND via this connection)?

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14th February 2010, 09:20 PM	#213
acidbrain diyAudio Member Join Date: May 2008	I matched them only to have equal gain for both channels, not to have the same gain as the 2sk170 did. It worked fine. quote Andrew T. : The BL is a 6 to 12mA device the 862 is 10 to 25mA device. Look at the BL 12mA example of transconductance. You will see they show 30 to 40mS from 5mA to 10mA Id. Choosing a very high BL, or a low V grade, will give a similar range of Yfs, if you run them at similar high Id.

15th February 2010, 10:47 AM	#214
spcspc20000 diyAudio Member Join Date: Feb 2010	It should be builded smaller ,i think so.

9th April 2010, 07:35 PM	#215
gervenja diyAudio Member Join Date: May 2008 Location: Den Haag	Any boards left? no kits

9th April 2010, 08:17 PM	#216
acidbrain diyAudio Member Join Date: May 2008	Pearl Two

24th June 2010, 08:59 PM	#217
gotoma8 diyAudio Member Join Date: Apr 2006 Location: SF/Bay Area	anxiously awaiting the kit... T

13th November 2012, 10:32 AM	#220
Sodejuu diyAudio Member Join Date: Mar 2004 Location: Remunj	I got the complete kit a few days ago. That kit contains 2 mainboards, 2 MC pre boards and 2 PSU boards. This threat is about the MC pre boards, so that is also what my question is about. Once again, Why wasn't "Star" not connected to "Star1" when there is room on the PCB to do so? Is it better to connect "Star1" to GND and leave "Star" connected to 0V (so not shorting 0V to GND via this connection)?